Philosophers

I never thought philosophy would be so deadly

New concepts

• Threads
• Mutexes
• Data races
• Posix semaphores

Allowed args

• number_of_philosophers
• time_to_die
• time_to_eat
• time_to_sleep
• [number_of_times_each_philosopher_must_eat]

Allowed externals

memset, printf, malloc, free, write, usleep, gettimeofday, pthread_create, pthread_detach, pthread_join, pthread_mutex_init, pthread_mutex_destroy, pthread_mutex_lock, pthread_mutex_unlock

Study

great playlist about Threads https://www.youtube.com/playlist?list=PLfqABt5AS4FmuQf70psXrsMLEDQXNkLq2

• pthread needs to be added as link option to cc
• pthread_join function is kind of "wait" for threads
• executable files compiled on Linux are failing to run on Mac (zsh: exec format error:)
• process can contain multiple threads
• all threads can access all variables - they have common address in memory
• avoid using usleep directly with amount of time needed for activity as usleep is not very precise and the problem grows bigger with bigger numbers